Each week, we spotlight a cool innovation recommended by some of the industry's top tech writers. This week's pick is a true wireless charger.

The Forever Sleeve is the "Holy Grail" of charging devices, said Mark Spoonauer at Tom's​ Guide. Techies have been talking about "true wireless, over-the-air charging for three years without anything real to show for it." Now it's here. The phone case has a battery that gets its power from a transmitter set in the ceiling or a corner of your home. At a distance of two meters — about 6½ feet — the transmitter, which converts radio waves into electricity, can power your phone in about six or seven hours.

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But if you keep it in the case "you should never really have to worry about recharging a phone" when you're at home. The developer of the technology, Bellevue, Wash.–based Ossia, showed it off in a bulky prototype at January's Consumer Electronics Show, but a sleeker model should be ready in 2020.